I just think it's too much to get both those QB's.
RG3
I think with Rg3 it's his ego ( refuses to embrace the running QB style), and the fact that he's not a good pocket passer. All the teams he has visited ( Broncos, Browns, and Jets) are going to want a QB who can throw it vertically from the pocket. Look at the teams and the coaches. Hue Jackson ( Andy Dalton), Chan Gailey ( Ryan Fitzpatrick), and Broncos ( Peyton manning, Brock Osweiler). Griffin is just not that good at throwing it consistently. Mike Shanahan knew this before he drafted RG3, that's why he drafted Kirk Cousins. There's no market for RG3.
Colin Kapernick
I think the 49ers still want him. This is Chip Kelly last chance in the NFL, and he believes that Kapernick gives him the type of QB he always wanted. Which means he completes quick passes and runs well. Also York would look like a complete failure if Kapernick leaves. His ego is too big to allow this to happen. Wouldn't be surprised if the 49ers are asking for an impossible amount from interesting teams.